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JWT Decoder

Decode JSON Web Tokens to inspect the header, payload, and signature. Check token expiration status.

What is a JWT?

A JSON Web Token (JWT) is a compact, URL-safe token format used for securely transmitting information between parties. It consists of three parts separated by dots: a header (algorithm and type), a payload (claims and data), and a signature (verification).

How to use

  1. Paste your JWT token into the input field
  2. Click "Decode" to see the decoded header, payload, and signature
  3. The token parts are color-coded: header (red), payload (purple), signature (blue)
  4. If the token contains an expiration claim (exp), the status is shown automatically